Locking protractor



FIG. 1 is a perspective view of a locking protractor showing my new design in an open configuration;

FIG. 2 is a perspective view of a locking protractor as in FIG. 1, shown in a closed configuration;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM The ornamental design for a locking protractor, as shown and described. 